帮忙看看这句话怎么翻译 剑桥雅思6听力test3 的section 4中的一句话

the body of the plough would have been of wood and could have been drawn by people ,but it's also likely that cattle were used

主要是and could have been drawn by people  这句应该怎么理解啊

雅思哥 发表于 2012-1-10 22:17
/ P  {7 O5 J" }  b5 f已经可以被人们绘制。。。。

多谢雅思哥